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APPENDIX G
SERIAL INTERFACE
SPECIFICATIONS
This printer provides a very flexible RS232C serial interface
as an option. It can communicate at rates from 150 to 19,200
baud (bits per second) and supports four different kinds of hand-
shaking. This interface can also function as a 20mA current
loop interface. The operating specifications of the interface are
as follows:
Data transfer rate:
150-19200
Word length:
1 start bit
7 or 8 data bits
Odd, even or no
1 or 2 stop bits
parity
Signal levels:
Mark or logical 1, –3 to –15 volts or
current ON
Space or logical O, +3 to +15 volts or
current OFF
Handshaking: Serial BUSY, 1 byte mode
Serial BUSY, 1 block mode
ACK mode
XON/XOFF mode
Note:
19200baud can be used only with an RS232C interface; it
cannot be used with a 20mA current loop interface.
The optional board has a DB-25 female connector to connect
to a computer. The functions of the pins are summarized in
Table G-1.
CONFIGURING THE SERIAL INTERFACE
The DIP switch on the serial interface board controls the con-
figuration of the serial interface. Table G-2 describes the func-
tions of the individual switches in DIP switch.